/* ============================================================
   FRANKFURTER WINTERDIENST — DESIGN SYSTEM
   css/design-tokens.css
   Core CSS custom properties, typography, resets, utilities
   ============================================================ */

/* ---- GOOGLE FONTS (self-hosted via assets/fonts/) ---------- */
/* NOTE: Replace @import below with @font-face once font files
   are placed in assets/fonts/outfit/ (production requirement) */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&display=swap');

/* ---- COLOR TOKENS ----------------------------------------- */
:root {
  /* Brand palette — Ice Blue + Amber */
  --clr-brand-dark:    #0D2137;   /* Deep navy — primary brand dark */
  --clr-brand-mid:     #1A4A7A;   /* Steel blue — mid tone */
  --clr-brand-light:   #2A6BAA;   /* Lighter blue — hover states */
  --clr-accent:        #F59E0B;   /* Amber — high visibility, CTAs */
  --clr-accent-hover:  #D97706;   /* Amber dark — hover */
  --clr-accent-pale:   #FEF3C7;   /* Amber pale — backgrounds */

  /* Neutral palette */
  --clr-white:         #FFFFFF;
  --clr-off-white:     #F8FAFC;
  --clr-slate-50:      #F1F5F9;
  --clr-slate-100:     #E2E8F0;
  --clr-slate-200:     #CBD5E1;
  --clr-slate-400:     #94A3B8;
  --clr-slate-600:     #475569;
  --clr-slate-800:     #1E293B;
  --clr-slate-900:     #0F172A;

  /* Semantic aliases */
  --bg-page:           var(--clr-off-white);
  --bg-card:           var(--clr-white);
  --bg-alt:            var(--clr-slate-50);
  --bg-dark:           var(--clr-brand-dark);
  --text-primary:      var(--clr-slate-900);
  --text-secondary:    var(--clr-slate-600);
  --text-muted:        var(--clr-slate-400);
  --text-on-dark:      var(--clr-white);
  --border-color:      var(--clr-slate-100);

  /* Trust signals */
  --clr-green:         #16A34A;
  --clr-red:           #DC2626;

  /* ---- TYPOGRAPHY ---------------------------------------- */
  --font-family:       'Outfit', system-ui, -apple-system, sans-serif;
  --fw-regular:        400;
  --fw-medium:         500;
  --fw-semibold:       600;
  --fw-bold:           700;
  --fw-extrabold:      800;

  /* Strict heading sizes per AGENTS.md */
  --fs-h1-desktop:     3rem;
  --fs-h1-mobile:      2.2rem;
  --fs-h2-desktop:     2.25rem;
  --fs-body:           1rem;
  --fs-lead:           1.2rem;
  --fs-small:          0.875rem;
  --lh-heading:        1.15;
  --lh-body:           1.7;

  /* ---- SPACING ------------------------------------------- */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Section padding */
  --section-pad-y: 80px;

  /* ---- SHAPE -------------------------------------------- */
  --radius-sm:  4px;
  --radius-md:  10px;
  --radius-lg:  18px;
  --radius-xl:  28px;
  --radius-pill: 9999px;

  /* ---- SHADOW ------------------------------------------- */
  --shadow-sm:   0 2px 8px rgba(13,33,55,0.06);
  --shadow-md:   0 8px 24px rgba(13,33,55,0.09);
  --shadow-lg:   0 20px 48px rgba(13,33,55,0.13);
  --shadow-amber: 0 8px 24px rgba(245,158,11,0.30);

  /* ---- TRANSITIONS -------------------------------------- */
  --transition:       all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast:  all 0.18s ease;

  /* ---- LAYOUT ------------------------------------------- */
  --container-max: 1240px;
  --container-pad: 24px;
  --nav-height-top: 44px;
  --nav-height-main: 70px;
  --nav-total: calc(var(--nav-height-top) + var(--nav-height-main));
}

/* ---- CSS RESET + BASE ------------------------------------ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  color: var(--text-primary);
  background-color: var(--bg-page);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: var(--clr-brand-mid);
  transition: var(--transition-fast);
}
a:hover { color: var(--clr-brand-light); }

ul, ol { list-style: none; }

/* ---- TYPOGRAPHY SCALE ------------------------------------- */
h1, h2, h3, h4, h5 {
  line-height: var(--lh-heading);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
}

h1 { font-size: var(--fs-h1-desktop); letter-spacing: -0.5px; }
h2 { font-size: var(--fs-h2-desktop); letter-spacing: -0.3px; }
h3 { font-size: 1.35rem; font-weight: var(--fw-semibold); }
h4 { font-size: 1.1rem; font-weight: var(--fw-semibold); }

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  line-height: var(--lh-body);
}
p:last-child { margin-bottom: 0; }

/* ---- UTILITY CLASSES -------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.max-width-md  { max-width: 820px; margin-left: auto; margin-right: auto; }
.max-width-sm  { max-width: 640px; margin-left: auto; margin-right: auto; }

.section-pad   { padding: var(--section-pad-y) 0; }
.section-pad-sm { padding: 50px 0; }

.bg-white      { background-color: var(--clr-white); }
.bg-alt        { background-color: var(--bg-alt); }
.bg-dark       { background-color: var(--bg-dark); }
.bg-brand-mid  { background-color: var(--clr-brand-mid); }
.bg-accent-pale { background-color: var(--clr-accent-pale); }

.text-center   { text-align: center; }
.text-small    { font-size: var(--fs-small); }
.text-lead     { font-size: var(--fs-lead); color: var(--text-secondary); }
.text-on-dark  { color: var(--text-on-dark); }
.text-accent   { color: var(--clr-accent); }
.text-muted    { color: var(--text-muted); }
.text-green    { color: var(--clr-green); }
.text-red      { color: var(--clr-red); }

.fw-medium     { font-weight: var(--fw-medium); }
.fw-semibold   { font-weight: var(--fw-semibold); }
.fw-bold       { font-weight: var(--fw-bold); }

.radius-lg     { border-radius: var(--radius-lg); }
.radius-md     { border-radius: var(--radius-md); }
.shadow-md     { box-shadow: var(--shadow-md); }

/* ---- BUTTON SYSTEM ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-md);
  font-weight: var(--fw-semibold);
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  text-align: center;
}

.btn-primary {
  background: var(--clr-accent);
  color: var(--clr-slate-900);
  border-color: var(--clr-accent);
}
.btn-primary:hover {
  background: var(--clr-accent-hover);
  border-color: var(--clr-accent-hover);
  color: var(--clr-slate-900);
  transform: translateY(-2px);
  box-shadow: var(--shadow-amber);
}

.btn-secondary {
  background: transparent;
  color: var(--clr-white);
  border-color: rgba(255,255,255,0.5);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--clr-white);
  color: var(--clr-white);
}

.btn-outline-dark {
  background: transparent;
  color: var(--clr-brand-dark);
  border-color: var(--clr-brand-dark);
}
.btn-outline-dark:hover {
  background: var(--clr-brand-dark);
  color: var(--clr-white);
}

.btn-phone {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: var(--fw-semibold);
  color: var(--clr-white);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}
.btn-phone:hover {
  background: var(--clr-accent);
  color: var(--clr-slate-900);
  border-color: var(--clr-accent);
}
.btn-phone i { font-size: 0.8rem; }

/* ---- GRID LAYOUTS ----------------------------------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }

/* ---- SCROLL REVEAL ANIMATIONS ----------------------------- */
.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- RESPONSIVE ------------------------------------------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-pad-y: 60px; }
  h1 { font-size: var(--fs-h1-mobile); }
  h2 { font-size: 1.75rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  :root { --container-pad: 16px; }
}